4A分子筛改性催化剂制备及其吸附氨氮的性能

Preparation of modified 4A molecular sieve and performance for ammonia adsorption

分别采用过渡金属(Fe,Zn,Cr,Cu)、盐酸、氢氧化钠以及十二烷基硫酸钠(SDS)对4A分子筛改性,并测其吸附污水中氨氮性能。结果表明,Fe和SDS协同改性的4A分子筛去除氨氮性能最佳,在25℃时,单分子层饱和吸附量为3.20 mg/g,其吸附动力学符合准二级反应动力学方程。

4A Molecular sieves were modified with transition metal,such as Fe,Cu,Zn,Cr,HCl,Na OH and sodium dodecylsulfate,and the performances of ammonia adsorption were measured. The results show that Fe and SDS collaborative remove ammonia nitrogen performance is best,modified 4A molecular sieves and the theoretical maximum adsorption capacity is 3. 20 mg/g,at 25 ℃. The dynamic adsorption data were well described by pseudo-second-order reaction rate model.